Burglar-alarm.



Patented Dec; 3. I90l.

BROWN.

B'uneLAn ALARM. (Application filed July 23, 1901.)

(No: Model.)

m: nonms PETERS co. PNOT0-L|TNO.WA$NINGTON, 0. cv

UNITED STATES WATOY BROWN, OF DAWSON SPRINGS, KENTUCKY.

BU RGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 7, dated December 1901-Application filed July 23, 1901.

To all whom it may concern.-

Be it known that I, WATGY BROWN, a citizen of the United States,residing at Dawson Springs, in the county of Hopkins and State ofKentucky, have invented a new and useful Burglar-Alarm, of which thefollowing is a specification.

This invention relates to burglar-alarms, and has for its object toprovide an improved device of this character which is arranged to soundan alarm as the burglar approaches a door and before the latter has beenopened, or it may be arranged inside the door, so as not to operateuntil thesill is crossed. It is furthermore designed to provide meansfor adjusting the device so as throw the same out of action-as, forinstance, during the daytime-in order that the alarm may not be soundedevery time a person passes through the doorway.

With these and other objects in view the present invention consists inthe combination and arrangement of parts, as will be hereinafter morefully described, shown in the accompanying drawings, and particularlypointed out in the appended claims, it being understood that changes inthe form,proportion, size, and minor details may be made within thescope of the claims without departing from the spirit or sacrificing anyof the advantages of the invention.

In the drawings, Figure 1 is a sectional elevation of the present deviceapplied to a doorway and in position for action. Fig. 2 is a similarview showing the device thrown out of action to permit of the doorwaybeing used without sounding an alarm. Fig. 3 is a detail top plan viewillustrating a part of the means for locking the device out of action.

Corresponding parts are designated by like characters of reference inall of the figures of the drawings.

Referring to the drawings, 1 designates a portion of a door-frame havingthe usual sill 2 and the door 3 hinged to the frame and swung open overa porch 4. That portion of the porch adjacent to the door-sill is cutloose from the surrounding porch, so as to form a movable platform 5,which is yieldingly supported upon suitable springs 6, that are in turnsupported upon the ground or other sup- Serial No. 69,443. (No model.)

port. 'Also this platform has a slight end- Wise movement toward thedoor-sill. At each side of the platform there is provided a pair ofpendent standards 7, which are pivoted intermediate of their ends uponsuitable hangers 8, which are pendent from the under side of theplatform. The lower ends of each pair of standards is connected by meansof alink 9, so that the standards are adapted to swing simultaneously inthe same direction. The purpose of these standards is to rigidly supportthe platform in the manner shown in Fig. 2 of the drawings when thedevice has been thrown out of operation.

To control the swinging standards, each of the rear standards isprovided with an adjusting rod or link 10, which has its forward endpivotally connected to the upper end of the standard, as indicated at11, and the free rear ends of these rods are connected by means of atransverse bar 12, the ends of which project a suitable distance beyondthe respective adjusting-rods. At each opposite side of the platform andin rear thereof there is provided a post 13, from which extends arearwardly and downwardly inclined bracebar 14, which is provided in itsupper side with at least two notches 15 for the reception of theadjacent end of the connecting transverse bar 12, so as to lock theswinging standards in their opposite positions, as clearly illustratedin the drawings.

The signal device is preferably formed by means of a pistol 16, which iscarried by a rock-bar 17, each end of which is provided with a pivot-pinor spindle 18, that is journaled in the inner side of the post 13, asbest shown in Fig. 3. This rook-bar is provided with a plurality ofperforations 19 for the reception of the barrel of the pistol, in orderthat the latter may be adjusted longituditudinally of the rock-bar. Asuitable hanger 20 is carried by the bar and has its lower end connectedto the butt of the pistol, so as to effectively connect the latter tothe bar. At one end of the rock-bar there is provided a crank-handle 21,connected to the extremity of the adjacent spindle, as shown in Fig. 3,so as to provide means for rocking the bar, whereby the angle ofinclination of the pistol may be adjusted, and said crank-handle What isclaimed is-- j 1. Inabur'glar-alarm,the combination with a yieldableplatform, of a signal operatively connected thereto, vertically-foldablesupporting-standards fulcrumed upon the platform, and meansfor lockingthe standards in their operative and inoperative positions.

2. In a burglar-alarm, the combination with a yieldable platform, of asignal operatively connected thereto, opposite v pairs ofvertically-foldable standards fulcrumed upon the platform, linksconnecting the members of the pairs of standards for simultaneousmovement in the same direction, opposite adjustin grods pivotallyconnected to the respective pairs of standards, a'transverseconnectingbar connecting the adjusting-rods, and opposite pairs of seatsfor the reception of the transverse connecting-bar.

3. In a burglar-alarm, the combination with a yieldable platform, of asignal, an adjustable rock-bar carrying the signal, said rockis providedwith a thumb-screw 21, which may engage in one or other of openings 21in a curved bar 21 to lock the bar 17 and'the pistol in the adjustedposition. It will of course be understood that the pistol when the alarmis set for action is directed toward the platform, so as to shootthrough the latter and hit the person who may be standing thereon, andwhen out of action the pistol is directed in a horizontal line ordownwardly.

The signal-actuating connection between the platform and the signal isformed by means of an arm 22, which is fixedly pendent from the bottomof the platform and inclines downwardly and rearwardly and is providedat its rear end with a trip-head 23, having a perforation for thereception of the trigger of the pistol. It will now be apparent that theslight downward and endvise movement of the platform caused by a personstepping thereon will also force the arm downwardly and rearwardlyagainst the trigger of the pisto], thereby shooting the latter andoperating the alarm.

The device may erative and inoperative positions and a trip connectionbetween the platform and the signal.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence be placed outside the doorsill to form partof the porch, if the house he provided with one, or it may be placedwithin the door-sill, as shown by dotted lines in Figs. 1 and 2, so asnot to be operated until the door is actually opened and the intruderpast the sill. This latter position of the device renders itparticularly valuable on mail-cars and the like.

of two witnesses.

\VATCY BROWN.

Witnesses:

W. D. RICE, PEARL WALKER.

bar being adjustable to move the signal to op-

